mirror of
https://github.com/go-gitea/gitea.git
synced 2024-08-16 17:43:26 +02:00
191 lines
6.8 KiB
Go
191 lines
6.8 KiB
Go
// Copyright 2023 The Gitea Authors. All rights reserved.
|
|
// SPDX-License-Identifier: MIT
|
|
|
|
package db
|
|
|
|
import (
|
|
"errors"
|
|
"fmt"
|
|
"strings"
|
|
|
|
"code.gitea.io/gitea/modules/container"
|
|
"code.gitea.io/gitea/modules/log"
|
|
"code.gitea.io/gitea/modules/setting"
|
|
|
|
"xorm.io/xorm"
|
|
"xorm.io/xorm/schemas"
|
|
)
|
|
|
|
type CheckCollationsResult struct {
|
|
ExpectedCollation string
|
|
AvailableCollation container.Set[string]
|
|
DatabaseCollation string
|
|
IsCollationCaseSensitive func(s string) bool
|
|
CollationEquals func(a, b string) bool
|
|
ExistingTableNumber int
|
|
|
|
InconsistentCollationColumns []string
|
|
}
|
|
|
|
func findAvailableCollationsMySQL(x *xorm.Engine) (ret container.Set[string], err error) {
|
|
var res []struct {
|
|
Collation string
|
|
}
|
|
if err = x.SQL("SHOW COLLATION WHERE (Collation = 'utf8mb4_bin') OR (Collation LIKE '%\\_as\\_cs%')").Find(&res); err != nil {
|
|
return nil, err
|
|
}
|
|
ret = make(container.Set[string], len(res))
|
|
for _, r := range res {
|
|
ret.Add(r.Collation)
|
|
}
|
|
return ret, nil
|
|
}
|
|
|
|
func findAvailableCollationsMSSQL(x *xorm.Engine) (ret container.Set[string], err error) {
|
|
var res []struct {
|
|
Name string
|
|
}
|
|
if err = x.SQL("SELECT * FROM sys.fn_helpcollations() WHERE name LIKE '%[_]CS[_]AS%'").Find(&res); err != nil {
|
|
return nil, err
|
|
}
|
|
ret = make(container.Set[string], len(res))
|
|
for _, r := range res {
|
|
ret.Add(r.Name)
|
|
}
|
|
return ret, nil
|
|
}
|
|
|
|
func CheckCollations(x *xorm.Engine) (*CheckCollationsResult, error) {
|
|
dbTables, err := x.DBMetas()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
res := &CheckCollationsResult{
|
|
ExistingTableNumber: len(dbTables),
|
|
CollationEquals: func(a, b string) bool { return a == b },
|
|
}
|
|
|
|
var candidateCollations []string
|
|
if x.Dialect().URI().DBType == schemas.MYSQL {
|
|
if _, err = x.SQL("SELECT @@collation_database").Get(&res.DatabaseCollation); err != nil {
|
|
return nil, err
|
|
}
|
|
res.IsCollationCaseSensitive = func(s string) bool {
|
|
return s == "utf8mb4_bin" || strings.HasSuffix(s, "_as_cs")
|
|
}
|
|
candidateCollations = []string{"utf8mb4_0900_as_cs", "uca1400_as_cs", "utf8mb4_bin"}
|
|
res.AvailableCollation, err = findAvailableCollationsMySQL(x)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
res.CollationEquals = func(a, b string) bool {
|
|
// MariaDB adds the "utf8mb4_" prefix, eg: "utf8mb4_uca1400_as_cs", but not the name "uca1400_as_cs" in "SHOW COLLATION"
|
|
// At the moment, it's safe to ignore the database difference, just trim the prefix and compare. It could be fixed easily if there is any problem in the future.
|
|
return a == b || strings.TrimPrefix(a, "utf8mb4_") == strings.TrimPrefix(b, "utf8mb4_")
|
|
}
|
|
} else if x.Dialect().URI().DBType == schemas.MSSQL {
|
|
if _, err = x.SQL("SELECT DATABASEPROPERTYEX(DB_NAME(), 'Collation')").Get(&res.DatabaseCollation); err != nil {
|
|
return nil, err
|
|
}
|
|
res.IsCollationCaseSensitive = func(s string) bool {
|
|
return strings.HasSuffix(s, "_CS_AS")
|
|
}
|
|
candidateCollations = []string{"Latin1_General_CS_AS"}
|
|
res.AvailableCollation, err = findAvailableCollationsMSSQL(x)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
} else {
|
|
return nil, nil
|
|
}
|
|
|
|
if res.DatabaseCollation == "" {
|
|
return nil, errors.New("unable to get collation for current database")
|
|
}
|
|
|
|
res.ExpectedCollation = setting.Database.CharsetCollation
|
|
if res.ExpectedCollation == "" {
|
|
for _, collation := range candidateCollations {
|
|
if res.AvailableCollation.Contains(collation) {
|
|
res.ExpectedCollation = collation
|
|
break
|
|
}
|
|
}
|
|
}
|
|
|
|
if res.ExpectedCollation == "" {
|
|
return nil, errors.New("unable to find a suitable collation for current database")
|
|
}
|
|
|
|
allColumnsMatchExpected := true
|
|
allColumnsMatchDatabase := true
|
|
for _, table := range dbTables {
|
|
for _, col := range table.Columns() {
|
|
if col.Collation != "" {
|
|
allColumnsMatchExpected = allColumnsMatchExpected && res.CollationEquals(col.Collation, res.ExpectedCollation)
|
|
allColumnsMatchDatabase = allColumnsMatchDatabase && res.CollationEquals(col.Collation, res.DatabaseCollation)
|
|
if !res.IsCollationCaseSensitive(col.Collation) || !res.CollationEquals(col.Collation, res.DatabaseCollation) {
|
|
res.InconsistentCollationColumns = append(res.InconsistentCollationColumns, fmt.Sprintf("%s.%s", table.Name, col.Name))
|
|
}
|
|
}
|
|
}
|
|
}
|
|
// if all columns match expected collation or all match database collation, then it could also be considered as "consistent"
|
|
if allColumnsMatchExpected || allColumnsMatchDatabase {
|
|
res.InconsistentCollationColumns = nil
|
|
}
|
|
return res, nil
|
|
}
|
|
|
|
func CheckCollationsDefaultEngine() (*CheckCollationsResult, error) {
|
|
return CheckCollations(x)
|
|
}
|
|
|
|
func alterDatabaseCollation(x *xorm.Engine, collation string) error {
|
|
if x.Dialect().URI().DBType == schemas.MYSQL {
|
|
_, err := x.Exec("ALTER DATABASE CHARACTER SET utf8mb4 COLLATE " + collation)
|
|
return err
|
|
} else if x.Dialect().URI().DBType == schemas.MSSQL {
|
|
// TODO: MSSQL has many limitations on changing database collation, it could fail in many cases.
|
|
_, err := x.Exec("ALTER DATABASE CURRENT COLLATE " + collation)
|
|
return err
|
|
}
|
|
return errors.New("unsupported database type")
|
|
}
|
|
|
|
// preprocessDatabaseCollation checks database & table column collation, and alter the database collation if needed
|
|
func preprocessDatabaseCollation(x *xorm.Engine) {
|
|
r, err := CheckCollations(x)
|
|
if err != nil {
|
|
log.Error("Failed to check database collation: %v", err)
|
|
}
|
|
if r == nil {
|
|
return // no check result means the database doesn't need to do such check/process (at the moment ....)
|
|
}
|
|
|
|
// try to alter database collation to expected if the database is empty, it might fail in some cases (and it isn't necessary to succeed)
|
|
// at the moment, there is no "altering" solution for MSSQL, site admin should manually change the database collation
|
|
if !r.CollationEquals(r.DatabaseCollation, r.ExpectedCollation) && r.ExistingTableNumber == 0 {
|
|
if err = alterDatabaseCollation(x, r.ExpectedCollation); err != nil {
|
|
log.Error("Failed to change database collation to %q: %v", r.ExpectedCollation, err)
|
|
} else {
|
|
_, _ = x.Exec("SELECT 1") // after "altering", MSSQL's session becomes invalid, so make a simple query to "refresh" the session
|
|
if r, err = CheckCollations(x); err != nil {
|
|
log.Error("Failed to check database collation again after altering: %v", err) // impossible case
|
|
return
|
|
}
|
|
log.Warn("Current database has been altered to use collation %q", r.DatabaseCollation)
|
|
}
|
|
}
|
|
|
|
// check column collation, and show warning/error to end users -- no need to fatal, do not block the startup
|
|
if !r.IsCollationCaseSensitive(r.DatabaseCollation) {
|
|
log.Warn("Current database is using a case-insensitive collation %q, although Gitea could work with it, there might be some rare cases which don't work as expected.", r.DatabaseCollation)
|
|
}
|
|
|
|
if len(r.InconsistentCollationColumns) > 0 {
|
|
log.Error("There are %d table columns using inconsistent collation, they should use %q. Please go to admin panel Self Check page", len(r.InconsistentCollationColumns), r.DatabaseCollation)
|
|
}
|
|
}
|